Top Angular 2 Interview Questions and Answers - Essential Guide for Job Seekers

To check this, you need to make sure that node is installed and then check if angular CLI is installed.

• Open a command prompt using cmd.
• Type node -v and npm -v to ensure node is installed.
• Type ng -v

The router-link derivatives enable the navigation from any specific view to the other. It works immediately as a user is performing application tasks. The link can directly arise from browser and navigation is done on the basis of user action like the click of an anchor tag.

The router link directive gives control to the router for anchor tag elements. It also binds a clickable HTML to the route to enable the navigation. The routerlink directive can easily be bound to an array, E.g.

<a [routerlink] = "[ '/ heroes']" >Heroes</a>

During Development Mode, caching for static resources can be done through the Design of Tools. If you want to cache on the production stage, you need to check and update the Server-End Settings accordingly.

Note: These are basic angular 2 interview questions that are asked for a position as SDE in Angular Development.

A filter is a necessary phase of Angular 2 as well as Angular 4. It is basically used to filter an object from a crew of items, which are there in an array or an object array. It selects a subset of the objects from an array and returns it as a new array and displayed on UI. Filters can be used with an expression using pipe | sign. {{expression | filterName:parameter }} Angular 2 includes various filters to layout records of special fact types.

In Angular 2, hidden property or [hidden] is a special case binding used to hide property. It can be compared close to ng-show and ng-hide, but more powerful to bind any property types of elements.

Both @input and @output are decorators. The decorator @Input is used to bind a property within one child component to receive value from the parent component, whereas we use the @output decorator to bind the property of a component to send data from child component to parent component or calling component.

To display error message in Angular 2 from backend, we have to set the error message equal to an angular variable, and then check whether that variable exists to conform whether to display it or not.

<div *ngIf="errors" class="alert alert-danger">
    {{ errors }}
</div>

Flex Layout in Angular 2 is a component engine that allows you to create Flexbox page layouts with a fixed set of directives to use in designing templates. The Flex-Layout has made styling easy and user-friendly by having a TypeScript based Library, thus eliminating the need for external stylesheets/CSS Styling. In addition to this, it can be used along with Material Design for Design components and also providing intuitive breakpoints while development to aid in designing responsive layouts.

SPA in Angular 2 stands for Single Page Applications. This is a type of web-application which fits into literally one page. All your code (JavaScript, HTML, CSS) is called using a single page load at multiple points by adding new data parallelly from the backend. Navigation between pages performed can be done without refreshing.

PrimeNG is a rich UI component collection dedicated to Angular. Widgets present here are completely open-source and free to use. It’s simple, lightweight yet powerful and optimized for responsive cross-browser touch.